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powerpc64: fix 64-bit process detection on embedded
* syscall.c (get_scno) [POWERPC64]: Fix 64-bit process detection
on embedded powerpc.
Upstream-Status: Backport
Signed-off-by: James Yang <james.yang@freescale.com>
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
diff --git a/syscall.c.orig b/syscall.c
index 7efee0e..72d9453 100644
--- a/syscall.c.orig
+++ b/syscall.c
@@ -1207,11 +1207,14 @@ get_scno(struct tcb *tcp)
/* Check for 64/32 bit mode. */
if (upeek(tcp, sizeof(unsigned long)*PT_MSR, &val) < 0)
return -1;
- /* SF is bit 0 of MSR */
- if (val < 0)
- currpers = 0;
- else
- currpers = 1;
+
+ /*
+ * Check for 64/32 bit mode.
+ * Embedded implementations covered by Book E extension of PPC use
+ * bit 0 (CM) of 32-bit Machine state register (MSR).
+ * Other implementations use bit 0 (SF) of 64-bit MSR.
+ */
+ currpers = (val & 0x8000000080000000) ? 0 : 1;
update_personality(tcp, currpers);
# endif
#elif defined(AVR32)
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